Recently during my Blender classes, some gifted students asked me to explain again rigging techniques for SecondLife. I already have spoken about this in some other posts (in Italian) on this magazine. I made available some Youtube playlists on this topic:

Get script to properly export to Collada format (this version was corrected by Gaia for versions 2.60 and up)

Typical workflow consists(consisted) in following phases:

Build the piece of cloth around the upper/lower body mesh, using the shrink wrap modifier

Parent the cloth to the armature with automatic weights or empty weights.

Copy weigths with the new tool in Blender 2.66a Copy weights from base avatar using slow python script provided by Gaia, operation that could take more than 10 minutes to accomplish, or use the extra plugin Mesh Transfer.

Adapht weights with armature posing and using WeightPainting

Export the cloth to SL via collad (with proper plugin)

As you can notice, the essential workflow is basically unchanged, but single operations have been greatly simplified: it is not more needed to go shopping external scripts. Now basic functions are integrated in Blender off the shelf.

For instance, Weight Copying can be obtained simply selecting source weighted avatar and then shift-selecting your clothe. Now you can see Weight Paint option on the proper tool shelf on the right. (I thank http://blog.nalates.net/2013/04/01/weight-copy-blender-2-66a/ who made me discover this hidden jewel in Blender 2.66 user interface !)